[jojo]
the virgin shonen manga
- gets on a boat and stays on it for years at a time

the chad jojo
- gets on a boat, has a fun boat puzzle and will get off it next week

source

I don't even have to look at the source to know that first one's Berserk.

how dare

Actually I think it's HxH; Berserk is very much not a shonen manga

It can refer to both, honestly

And Yu-Gi-Oh, for that matter, especially if "a boat" is "an airship"

they were briefly on a boat